log_file log_date log_time ocn year
ocn.log.160513-140117   160513   140117        0
ocn.log.160513-214932   160513   214932        0
ocn.log.160514-021350   160514    21350        0
ocn.log.160514-145204   160514   145204        1
ocn.log.160515-080259   160515    80259        1
ocn.log.160515-154532   160515   154532        2
ocn.log.160516-071012   160516    71012        2
ocn.log.160516-133453   160516   133453        2
ocn.log.160516-183926   160516   183926        3
ocn.log.160517-022700   160517    22700        3
ocn.log.160517-080000   160517    80000        4